[Bro] External commands - Error

[Bernhard Amann]

Hi,

you have to use Exec::run inside of a when statement - because the command is run asynchronously results are not immediately available.

You can e.g. see https://github.com/bro/bro/blob/master/scripts/base/utils/dir.bro for an example that uses it.

Bernhard

On Apr 16, 2014, at 8:03 AM, Riccardo Bortolameotti <r.bortolameotti at gmail.com> wrote:

> 
> Hello everybody,
> 
> I am having a problem regarding external command execution. 
> 
> This is the piece of code:
> function f (s : string) :  Exec::Result 
> {
> 	local anagram : Exec::Command;
> 	local res : Exec::Result;
> 	res = [$exit_code = 0];
> 	local prog = "/home/riccardo/ngram-ids/ngram-ids/ngram-ids"; 
> 	local param = "-l /home/riccardo/ngram-ids/ngram-ids/save -m test -t 0 -U " + s;
> 	anagram = [$cmd = prog, $stdin = param];
> 	res = Exec::run(anagram);
> 	return res;
> }
> Basically the problem is that the variable res do not receive any value
> from the execution of the program. Since this execution should be run
> several times because is within a loop, I do not know if there are
> problems of threading (like wait for the result). I also receive an
> error like this:
> 
> 1394205441.982764 warning: non-void function returns without a value:
> Exec::run
> 1394205441.982764 error: return trigger in context which does not allow
> delaying result
> 
> thank you in advance,
> 
> R.
> 
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